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define DMS = random(1176,1224,uniform); 
define _LIMIT=100;

with results as 
(select  i_product_name
             ,i_brand
             ,i_class
             ,i_category
             ,inv_quantity_on_hand qoh
       from inventory
           ,date_dim
           ,item
           ,warehouse
       where  inv_date_sk=d_date_sk
              and inv_item_sk=i_item_sk
              and inv_warehouse_sk = w_warehouse_sk
              and d_month_seq between [DMS] and [DMS] + 11
       group by i_product_name,i_brand,i_class,i_category),
results_rollup as 
(select i_product_name, i_brand, i_class, i_category,avg(qoh) qoh 
from results 
group by i_product_name,i_brand,i_class,i_category
union all 
select i_product_name, i_brand, i_class, null i_category,avg(qoh) qoh 
from results
group by i_product_name,i_brand,i_class
union all 
select i_product_name, i_brand, null i_class, null i_category,avg(qoh) qoh 
from results
group by i_product_name,i_brand
union all 
select i_product_name, null i_brand, null i_class, null i_category,avg(qoh)  qoh 
from results
group by i_product_name
union all 
select null i_product_name, null i_brand, null i_class, null i_category,avg(qoh) qoh 
from results)
[_LIMITA] select [_LIMITB] i_product_name, i_brand, i_class, i_category,qoh
      from results_rollup
      order by qoh, i_product_name, i_brand, i_class, i_category
[_LIMITC];
